Hello adimatis
Not sure of the big stores but here is the Wersi Dealer, http://www.wersi.co.at/Anfahrt-3.html for other makes go to their European Web Sites, and you should be able to find the dealers from there.
Hope this helps.

Bill
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English Riviera:
Live entertainment, Real Ale, Great Scenery, Great Beaches, why would anyone want to live anywhere else (I�m definitely staying put).